But not under significant pressure or volume.
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And dont forget this about piston vs DI One of my favorite threads. https://www.m4carbine.net/showthread...m+Bolt+Carrier
I don't want anything to do with a piston in an AR. I love my DI guns. They cycle softly, and are just plain better at follow up shots. You also don't have to worry about wrecking your buffer tube or lower receiver. I was just bored and had an extra upper laying around. I was just looking for possibilities or feasibility of this kind of set up. I'm not looking to get rid of my buffer tube either. I have no need for a side folding stock, so I dont need a spring system under the handguards. I'm looking at it from a simple conversion point. Slightly increased diameter hole in upper receiver and barrel nut. I would feel confident that neither of those would pose a problem with reliabilty.
After typing in a few different key words all day on this subject I finally found this
http://tacticalcourses.com/archive/t...f=123&t=562748
Apparently a longer gas key tube looks to be part of Stoner's original design? The second picture down looks to be the prototype bakelite type hanguard with the BCG and the longer gas key tube . The only problem seems to be gas pressure relief? Knowing where and how big the holes need to be is the challenge. Finding out that the original design gas key tube was longer gives me a little optimism.